-97.3% is the change from 779 to 21
Calculation steps:
[( 21 - 779 ) ÷ 779] x 100 = -97.3%
Formula
Percentage change = [(21 - 779) / 779] x 100
Subtract the new number by the original number
21 - 779 = -758
-758 ÷ 779 = -0.9730423620025674
-0.9730423620025674 x 100 = -97.3%